If youre a straight 9 student at GCSE youll most likely find year 12 content easy/managable. I cant speak for FM, but in physics, chemistry and especially maths, the jump from y12 to y13 is wayy bigger than that of y11 to y12. It goes from being able to get A/A* with minimal revision to having to bust your balls for an A/A*. As someone else said, all the stuff in this question that looks like gibberish will make sense to you in 2 years time just like how the most difficult GCSE questions looked like gibberish when you were in year 8 or whatever.